Publication date: 15th December 2025
Carbon nitride, a polymeric material consisting of heptazine-based networks, has been extensively studied in photocatalytic processes owing to associated narrow band-gaps which allow visible light activity, as well as structural tunability which further modulate electronic and surface properties in favor of enhanced photoactivity for target chemical turn-overs. Particularly, poly(heptazine imide) (PHI) networks exhibit permanent ionic character, these charges being counter-balanced by common alkali such as Na+ or K+, which may be easily exchanged by other cationic species, targeting different structural or electronic modifications with implications in photocatalytic applications [1,2].
In this talk, I will highlight the importance of this ionic character in PHI networks, in conjuncture with observed photocatalytic performances. Mainly, the nature of such counter charge substituents plays an essential role in improving the lifetime of photogenerated electrons, phenomenology previously described for hybrid perovskites, while also facilitating and modulating catalytic processes dependent on electron/proton-transfer steps, the main applications of our group being either H2O2 evolution or the hydrogenation of CO2 and alkenes. Moreover, I will describe how chemical modifications of this nature have further implications in storing/stabilizing charge carriers over extended periods of time for potential dark-photocatalytic reactions or modified kinetic behaviors [3].
Our group gratefully acknowledges the Max Planck Society for financial support.
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